NegaDuck by Sean Hartter

Everyone hero needs their polar opposite to appear and fight them from time to time. It is the universes way of showing us that when our heroes are evenly matched against themselves, the good version will always win in the end. In the Disney Afternoon, the brave crimefighter Darkwing Duck would eventually be forced to do battle against himself from a negative universe. That negative version was appropriately named, NegaDuck.